I realized I forgot to paint the inside of the front cover. I'm trying to fix it now. What I did realize is that I have 3 extra 5'' slots left. I don't need multiple hard drive. I have an extra 120mm fan, too. Should I remove the covers and install it? Here is a diagram showing the current airflow. This is a view from the side opened. This doesn't show the 2 side panel fans at the bottom left of the case.
